[jiliyur]

hi every body
i simulate a section of engine and when do it i meet this warning
warning:the total mass of removed parcels is 2.52000e-11
what is the meaning of it? how can i solve it?

[jiliyur]

could everybody help me please

[Blanco]

Originally Posted by jiliyur

hi every body
i simulate a section of engine and when do it i meet this warning
warning:the total mass of removed parcels is 2.52000e-11
what is the meaning of it? how can i solve it?

It's just a warning stating that converge is removing parcels from the domain. The overall removed mass should remain small compared to injected mass, as in your case, moreover if you check your log file you'll find a specific warning obtained at each time step when parcels are effectively removed. This warning report the mass of the par els removed in a single time step, you'll find this to be very small too (something like 1e-12 kg).

It is normal to have parcels removed from the domain, converge simply "neglect" parcels very small which are of no interest from a fluid dynamic perspective, in order to avoid an increase in computational time.

Sent from my HUAWEI TAG-L01 using CFD Online Forum mobile app

[jiliyur]

Hi thaks for reply does this warning cause that combustion dont accure ? Because when i simulation my pressure graph draw motoring state and look like dont accure comustion another words fuel dont burn in my case

[MFGT]

Well, even if its a low load case and you injected 5mg of fuel, the amount of removed parcel mass is 0.0005%

So that should not affect combustion at all.

[jiliyur]

then with this explain i have to increase fuel that is true? if or not how can i resolve this problem

[MFGT]

If you have the exact same fuel in experiment and know the amount to 100.0000%, then yes. But I highly doubt that

2.5e-11 kg of fuel loss seems to be 1 parcel that has been removed.
That can not affect your combustion.

If your combustion is not taking place you have to look for other reasons.

[jiliyur]

Could you help me what reasons often cause to dont happen combustion?

[SamWijey]

There can be many reasons why the case is showing any combustion. First, can you compare your case set up to a corresponding example case? These example cases are set up to with our recommendations for typical IC Engine flow and combustion. After this step, if you still cannot figure out why your case does not burn please email the case files (*.in and *.dat) to support@convergecfd.com. Please use your official email for all correspondence with Convergent Science.

[jiliyur]

Tanks alot for your reply